CN102168764A

CN102168764A - Valve core of throttle valve for petroleum drilling manifold

Info

Publication number: CN102168764A
Application number: CN201010113761XA
Authority: CN
Inventors: 雷林
Original assignee: ZIGONG XINGYU CEMENTED CARBIDE TOOLING CO Ltd
Current assignee: ZIGONG XINGYU CEMENTED CARBIDE TOOLING CO Ltd
Priority date: 2010-02-25
Filing date: 2010-02-25
Publication date: 2011-08-31

Abstract

The invention discloses a valve core of a throttle valve for a petroleum drilling manifold. The valve core comprises a cylindrical valve core, and is characterized in that the side wall of the valve core is uniformly provided with two groups or more than two groups of orifices which are arrayed spirally; each group of orifices comprise two or more than two orifices; each orifice is communicated with the inner hole of the valve core; and the valve core as the further improvement provided by the invention, the pore diameter of each group of orifices which are arrayed spirally decreases from bottom to top. The valve core provided by the invention has the advantages of uniform stress and long service life, is easy to manufacture, and is difficult to leak.

Description

The throttle valve spool that is used for the oil drilling choke manifold

Technical field

The present invention relates to a kind of core part that relates to the choke manifold that is used for oil drilling: the throttle valve spool.

Background technique

As depicted in figs. 1 and 2, be widely used in the throttle valve spool 3 on the choke manifold at present, the cemented carbide that adopts is former raw material, its structure is a disc, one end face of spool 3 contacts with the valve seat of throttle valve, and the opposite side of spool 3 is provided with bulge loop 3a, and bulge loop 3a is provided with the groove 3b of several transmitting torques, on spool 3, establish a semicircle throttle orifice 3c who is communicated with its both sides partially, on valve seat and end face that spool 3 contacts, also be provided with perforate; During use, rich its rotational of spool 3, when semicircle throttle orifice 3c when perforate on the valve seat communicates, the throttle valve unlatching; When semicircle throttle orifice 3c and perforate were isolated, throttle valve cut out; But the shortcoming of this spool 3 is: 1) the end face area of contact is big; This just requires the contact plane of valve seat and spool 3 that quite high planeness, surface finishment will be arranged, because need to realize sealing by two end face contacts under the situation of closing, has increased difficulty of processing; 2) unidirectional perforate; Because unidirectional perforate, when closing, liquid is exerted pressure on spool 3 by the perforate of fixed valve base in the well, cause spool 3 single load bearings, easily turn on one's side, form the slit, cause leakage, and it is unstable that liquid stream inevitably can appear in unidirectional perforate, have eddy current, turbulent area, and folding stroke big (fillet direction angle of swing is bigger) can increase the wearing and tearing of sealing surface again, influence working life.

Summary of the invention

The objective of the invention is to above-mentioned deficiency, a kind of throttle valve spool that is used for the oil drilling choke manifold be provided at prior art, it have be easy to process, stressed evenly, be difficult for leaking, the advantage of long service life.

For achieving the above object, the throttle valve spool that is used for the oil drilling choke manifold of the present invention, comprise columnar spool, it is characterized in that on the sidewall of spool, being provided with in uniform way the throttle orifice that two groups or more is arranged in the shape of a spiral, every group of throttle orifice comprises two or more throttle orifices, and each throttle orifice all communicates with the endoporus of spool.

This spool adopts cylinder mode, and the surface is easy to grinding, grinding, polishing treatment, and is convenient to guarantee that quality of processing realizes high quality of fit; Because respectively to stressed even, spool axial float and circular runout can not take place circumference in valve seat, and the gap evenly, rationally, the wearing and tearing that can reduce friction like this are difficult for causing leakage again; Circumferential rotational angle is less, can realize the switching of leading to, dam, and switches steadily quick; Throttle orifice rises twist along axial direction, can effectively reduce an impurity material washing away in liquid and the liquid to the spool inwall, circumferential each hole contacts simultaneously, even the erosive wear of causing, each hole wear extent is even, the rate of wear that more original conventional construction single hole is through-flow is much smaller, therefore can significant prolongation working life;

As a further improvement on the present invention, the aperture of the throttle orifice of described every group of helical arrangement reduces successively by from bottom to up direction; This structure more meets the flow of fluid mechanics principle, further reduces an impurity material washing away the spool inwall in liquid and the liquid;

In sum, the present invention have be easy to process, stressed evenly, be difficult for leaking, the advantage of long service life.

Description of drawings

Fig. 1 is the plan view of existing throttle valve spool.

Fig. 2 is the A-A sectional view of Fig. 1.

Fig. 3 is the plan view of the embodiment of the invention.

Fig. 4 is the excircle unfolded drawing of Fig. 3.

Embodiment

The present invention is further illustrated below in conjunction with accompanying drawing.

By Fig. 3 and shown in Figure 4, this is used for the throttle valve spool of oil drilling choke manifold, comprise columnar spool 1, on the sidewall of spool 1, be provided with four groups of throttle orifices of arranging in the shape of a spiral in uniform way, every group of throttle orifice comprises four throttle orifices 2, the aperture of the throttle orifice 2 of every group of helical arrangement reduces successively by direction from bottom to up, and each throttle orifice 2 all communicates with the endoporus of spool 1;

This spool 1 adopts cylinder mode, and the surface is easy to grinding, grinding, polishing treatment, and is convenient to guarantee that quality of processing realizes high quality of fit; Because respectively to stressed even, spool 1 axial float and circular runout can not take place circumference in valve seat, and the gap evenly, rationally, the wearing and tearing that can reduce friction like this are difficult for causing leakage again; Circumferential rotational angle is less, can realize the switching of leading to, dam, and switches steadily quick; Throttle orifice 2 rises and the aperture reduces successively twist along axial direction, can effectively reduce an impurity material washing away in liquid and the liquid to the spool inwall, circumferential each hole contacts simultaneously, even the erosive wear of causing, each hole wear extent is even, the rate of wear that more original conventional construction single hole is through-flow is much smaller, therefore can significant prolongation working life.

Claims

1. throttle valve spool that is used for the oil drilling choke manifold, comprise columnar spool, it is characterized in that on the sidewall of spool, being provided with in uniform way the throttle orifice that two groups or more is arranged in the shape of a spiral, every group of throttle orifice comprises two or more throttle orifices, and each throttle orifice all communicates with the endoporus of spool.

2. the throttle valve spool that is used for the oil drilling choke manifold as claimed in claim 1 is characterized in that the aperture of the throttle orifice of described every group of helical arrangement reduces successively by from bottom to up direction.